This is a tire pressure reset tool designed to assist in the sensor relearn procedure. After each tire rotation, or replacement of tires, body control module, or tire pressure sensors, the relearning process must be performed to ensure accurate tire pressure value acquisition and display. Operation steps: 1. Ensure the vehicle is in TPMS learning state/mode. 2. Following the vehicle manufacturer's maintenance procedure, use the tool sequentially (front left, front right, rear right, rear left), positioning it near the tire sidewall close to the valve stem (the air filling inlet), then press the reset button. 3. The green LED light (TX light) will illuminate, indicating signal transmission. When the vehicle’s buzzer sounds, the matching process is successful. 4. Repeat the process for the remaining tires. Specifications: - Compact design for portability and easy handling - Enables real-time tire pressure monitoring functionality - Diagnostic sensing capability integrated - Universal compatibility with most vehicle models - For GM vehicles equipped with 315 MHz or 433 MHz Tire Pressure Monitoring (TPM) systems, the sensor relearn procedure is required after tire rotation, remote keyless entry receiver module replacement, or tire pressure sensor replacement. This procedure can be completed using specialized tool EL-50448 and applies to 2014 GM models as well. - Note: Only certain designated diagnostic tools can read tire pressure sensor data on model year 2012 and later vehicles. Package Included: 1 x Tire pressure reset instrument